Excluding Electroweak Baryogenesis in the MSSM

TL;DR

This paper demonstrates that recent Higgs search results from the LHC strongly exclude the possibility of electroweak baryogenesis in the MSSM, except for a narrow Higgs mass window, challenging previous theoretical scenarios.

Contribution

It provides the first comprehensive analysis combining LHC Higgs data to exclude electroweak baryogenesis in the MSSM with high confidence, especially in the Light Stop Scenario.

Findings

Higgs mass ~125 GeV data conflicts with EWBG predictions in MSSM

LHC Higgs searches exclude EWBG in MSSM at >95% CL in the non-decoupling limit

A small window around 117-119 GeV remains compatible with EWBG

Abstract

In the context of the MSSM the Light Stop Scenario (LSS) is the only region of parameter space that allows for successful Electroweak Baryogenesis (EWBG). This possibility is very phenomenologically attractive, since it allows for the direct production of light stops and could be tested at the LHC. The ATLAS and CMS experiments have recently supplied tantalizing hints for a Higgs boson with a mass of ~ 125 GeV. This Higgs mass severely restricts the parameter space of the LSS, and we discuss the specific predictions made for EWBG in the MSSM. Combining data from all the available ATLAS and CMS Higgs searches reveals a tension with the predictions of EWBG even at this early stage. This allows us to exclude EWBG in the MSSM at greater than (90) 95% confidence level in the (non-)decoupling limit, by examining correlations between different Higgs decay channels. We also examine the exclusion without the assumption of a ~ 125 GeV Higgs. The Higgs searches are still highly constraining, excluding the entire EWBG parameter space at greater than 90% CL except for a small window of m_h ~ 117 - 119 GeV.